Hi Shiva, OK, run $ROOTSYS/tutorials/cernstaff.C. You get the file cernstaff.root. Now in a Root session, do: TFile f("cernstaff.root"); T.SetFillColor(38); T.Fit("gaus","Age>>hAge","Grade>10","","bar2") Rene Brun On Fri, 12 Apr 2002, Siva Subramania wrote: > Dear Rene, > I used the same thing before giving the mail also, actually, when I > use ntuple.Fit("gaus","area"); I am getting a table of values of the > mean, sigma, error, step size, first derivative, and so on. But > nothing is plotted on the graph ie over the ntuple. I also have given > ntuple.SetOptFit(1111), still, nothing is displayed about the > probability, Chi2 and others on the Legend. So what to do now? I > tried a lot of things, but couldn't figure out. Still trying. Can you > do me a favor, try to give a solution based on the the TNtuple Example > script or the TTree Example given in the documentation. You have > plotted an ntuple graph, plotting the age distribution in the same > chapter on Trees, try to tell me, how would you now fit a gaussian > distribution to the age distribution shown. Please.... reply. > Thanx, > Yours, > Shiva. > > On Thu, 11 Apr 2002, Rene Brun wrote: > > > Hi Shiva, > > > > See TTree::Fit > > > > example: > > ntuple.Fit("gaus","px") > > > > Rene Brun > > > > On Thu, 11 Apr 2002, Siva Subramania wrote: > > > > > Hi, > > > I am new to using ntuples, I managed to understand about ntuples, and I > > > think, they are nearly the same as histograms, so if I can fit a gaussian > > > on to a histogram, I should be able to - on an ntuple also, but > > > I am having trouble with fitting a gaussian function on to a ntuple plot. > > > Can I do it or not? If I can, then how to? Please reply. > > > Thanx, > > > Yours, > > > Shiva. > > > > > > > >
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